We need a good criteria so we can choose correctly who to trust. And that good criteria can only be developed by feeding our minds with information and trying to analyse it in the most objective way possible.

I agree. Even though we can't really ever be 100% certain that we've made the right choice to trust certain sources, our reasoning and observational skills, when put to use, increase the probability of internalizing and adapting to actual facts, many-fold.

Thinking for ourselves is paramount to arriving at a reasonable estimate of all the facts.

Questioning our existence can be too much, but questioning the nature of our reality (this sounded like Westworld :P) is always an nice intellectual exercise.

Hahaha. Yes, questioning our existence is like trying to visualize infinity, times a million! It's something that I feel our brains aren't adequately equipped to do, at least not us "normal" (non-genius) people.

Agreed on the questioning the nature of reality, too. We have this type of questioning to thank for essentially all of our scientific advancements over the course of human history.